Updated release info.

git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@73018 62d5b8a3-27da-0310-9561-8e5933582275

setup.py

@@ -7,7 +7,7 @@ def read(*rnames):
 name = "zc.buildout"
 setup(
     name = name,
-    version = "1.0.0b20",
+    version = "1.0.0b21",
     author = "Jim Fulton",
     author_email = "jim@zope.com",
     description = "System for managing development buildouts",